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11kV Oil Immersed Distribution Transformer with Conservator

ENGELEC Oil immersed Distribution Transformer with oil conservator is equipped with an expansion tank or conservator mounted above the main tank. The expansion of the insulating liquid is compensated inside the conservator by the raising of the oil level. In the conservator the top of the oil is in contact with the air which must remain dry to avoid any oxidation. This is achieved by admitting the outside air in the conservator through a desiccating device containing silica-gel crystals. The HV and LV coil is continuously winded around the core with good concentricity and compact winding. Our product has advantages of low consumption and low noise pollution by combining new generation of technology good performance and energy saving. It is widely used in power distribution system.
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11kV Oil Immersed Distribution Transformer with Oil Conservator, S Series


We generally manufacture distribution transformers in this power range, mainly in two different types:

  1. Transformer with conservator tank (S),

  2. Hermetically sealed type (SM),

Below table will help to engineers to select the best option according to environmental conditions which transformer works in:


High Environmental TemperatureHigh AltitudeRural NetworkHigh HumidityOver Load ConditionsUnstable Loading
S
SM

Meanwhile here is the advantage-disadvantage of the S/SM types:

  • In SM type, tank pressure is more than S type. S type generally works under low pressure due to its open to atmosphere,

  • In SM type, cooling/insulation oil does not contact to the air (theoretically). Therefore oil maintenance period is longer than S type,

  • SM type transformers and their related parts generally work under higher temperature (If we evaluate S/SM work under same conditions).

♦ Conservator Type:

Transformer with conservator tank is the same as hermetic transformers with core and coil structure. The dimensions of the conservator tanks of this type of transformers are designed and manufactured as a result of calculations to store the conservator of the oil whose volume increases with temperature.

Since the transformers with conservator tanks are open to the atmosphere, the oil pressure is changed due to thermal effects, and the air exchange is ensured by taking the moisture of the air through the silica gel (air dryer) in the transformer tank.

As a result of the air exchange due to the temperature differences after usage, the transformer with the working conservator tank loses its silica gel properties over time and causes the humidification of the oil and its structure. For this reason, it is necessary to carry out maintenance such as changing the silica gel and measuring the puncture voltage by sampling the oil.


11kV Three phase hermetical oil immersed distribution transformer, SM series


Main Technical Parameters

Rated Power
   (kVA)

Primary Voltage
(kV)

H.V.Tapping Range

Secondary Voltage

(V)

Connection Group

No-load loss(kW)

On-load loss(kW)

25

11kV


10kV


  6kV

±5%

±2*2.5%


400V

415V

433V


Dyn11


Yyn0/Yzn1

0.10

0.60/0.63

50

0.13

0.87/0.91

63

0.15

1.04/1.00

80

0.18

1.25/1.31

100

0.20

1.50/1.58

125

0.24

1.80/1.89

160

0.27

2.20/2.31

200

0.33

2.60/2.73

250

0.40

3.05/3.2

315

0.48

3.65/3.83

400

0.57

4.30/4.52

500

0.68

4.15/5.41

630

0.81

6.20

800

0.98

7.50

1000

1.16

10.30

1250

1.37

12.00

1600

1.65

14.50

2000

1.96

19.8


If you have any enquiry about quotation or cooperation,please feel free to email us at info@engelec.cn or use the following enquiry form. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.
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